<template>
    <div>
      <!--  面包屑导航  -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>分类参数</el-breadcrumb-item>
      </el-breadcrumb>
      <!--  卡片试图区域  -->
      <el-card class="box-card">
        <!--   警告区域     -->
        <el-alert
          title="注意：只允许为第三级分类设置相关参数！"
          type="warning"
          :closable="false"
          show-icon>
        </el-alert>
        <!--   选择商品分类区域     -->
        <el-row class="options">
          <el-col>
            <span>选择商品分类: </span>
            <!--    级联选择框      -->
            <el-cascader
              v-model="seletedKeys"
              :options="cateList"
              :props="cateProps"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
        <!--    tab页签区域    -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!--     动态参数的面板     -->
          <el-tab-pane label="动态参数" name="many">
            <el-button type="primary" :disabled="isBtndisabled" @click="addDialogVisible=true">添加参数</el-button>
            <!--     动态参数表格     -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--  循环渲染tag标签  -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!--  输入的文本框  -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!--  添加按钮  -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDiolog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!--     静态属性的面板     -->
          <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" :disabled="isBtndisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!--     静态属性表格     -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--  循环渲染tag标签  -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!--  输入的文本框  -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!--  添加按钮  -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDiolog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!--   添加参数/属性的对话框   -->
      <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>
      <!--   修改参数/属性的对话框   -->
      <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form
          :model="editForm"
          :rules="editFormRules"
          ref="editFormRef"
          label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      cateList: [],
      seletedKeys: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入名称', trigger: 'blur' }
        ]
      },
      editForm: {},
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入名称', trigger: 'blur' }
        ]
      }
    }
  },
  computed: {
    // 如果按钮需要被禁用,则返回true.否则返回false
    isBtndisabled () {
      if (this.seletedKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.seletedKeys.length === 3) {
        return this.seletedKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败!')
      }
      this.cateList = res.data
      // console.log(this.cateList)
    },
    // 级联选择框选中项变化,会触发此函数
    handleChange () {
      this.getParamsData()
    },
    // Tab标签点击事件的处理函数
    handleTabClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数数据列表
    async getParamsData () {
      // 选中的不是三级分类
      if (this.seletedKeys.length !== 3) {
        this.seletedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      // 选中的是三级分类
      // console.log(this.seletedKeys)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败!')
      }
      // console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮,添加参数/属性
    addParams () {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加失败!')
        }
        this.$message.success('添加成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击编辑按钮,显示修改对话框
    async showEditDiolog (id) {
      this.editDialogVisible = true
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
    },
    // 监听对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击修改对话框的确定按钮,修改参数
    editParams () {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败!')
        }
        this.$message.success('修改参数信息成功!')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 根据id删除参数
    async removeParams (id) {
      const result = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 点击确定 返回值为：confirm
      // 点击取消 返回值为： cancel
      if (result !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 当按下回车键/失去焦点时,会触发该函数
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      // 如果没有return,证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 将对attr_vals 的操作,报错到数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 点击按钮,显示文本输入框
    showInput (row) {
      row.inputVisible = true
      // $nextTick方法的作用是:当页面上的元素被重新渲染之后,才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style scoped lang="scss">
  .options{
    margin: 15px;
  }
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
